4 Stating a Measurement In every measurement there is aNumber followed by aUnit from a measuring deviceThe number should also be as precise as the measurement!

5 ---The Universal Language of Measurement---The Metric System---The Universal Language of Measurement---Metric System – scientists & engineers use this language to communicateThe metric system is often referred to as the International System of Units (abbreviated “SI”).The metric system is based on the number 10 and multiples of 10.

6 Some Tools for MeasurementWhich tool(s) would you use to measure:A. temperatureB. volumeC. timeD. weight

7 Mass a measure of the amount of matter in an objectKilogram – the basic unit of mass in the metric system1 kg = 1000 grams

8 Weight a measure of the attraction between two objects due to gravityGravity - a force of attraction between two masses.The strength of the gravitational force between two objects depends on the masses of the objects and the distance between them:The greater the mass, the greater the gravitational force.The greater the distance between the two objects, the weaker the gravitational force between them.Newton (N) - the basic unit of weight in the metric system.

9 Mass vs. WeightAn object has a universal mass, but may have different weight depending on gravity.The mass of an object does not change.The weight of an object changes as a result of changes in gravity. Weight is only present with gravity.A pineapple on earth weighs more than on the moon because the earth’s gravity is greater. But the pineapple’s mass always remains the same wherever you go (unless you get hungry and eat it!).

19 Volume The amount of space an object takes upLiter – is the basic unit of volume in the metric system1 Liter = 1 LMilliliters and Liters are used to measure the volume ofliquidsCubic centimeters – is the metric unit used to measure the volume ofsolidsA cubic centimeter is equal to the volume of a cube that measures 1 cm by 1 cm by 1 cm (cm3).1cmA volume of a cubic centimeter (cm3) is exactly equal to the volume of one milliliter.1cm1cm= 1 cm3 = 1 mL

29 Density a measure of the amount of matter that occupies a unit certain volumeDensity = mass/volume(units are usually g/mL)The density of water = g/mLThis means that one gram of water occupies one milliliter of volume.The density of oil = g/mLIf lighter fluids float on heavier fluids, do you expect water to float on oil?

30 Sand grainsIf the human body is nearly 70% water, is it possible to float in quicksand? Should you get worried?

31 Length The distance between two pointsMeter – the basic unit of length in the metric system1 meter = 1 m

37 Temperature a measure of how hot or cold something isCelsius = a unit of temperature in the metric systemWater freezes at 0° C.Water boils at 100° C.Normal body temperature is 37° CRoom temperature is 21° C.